fix(pds-text): add span as tag option

[QuintonJason]

Description

Adds span as a valid option for the tag prop on pds-text, so the component can render as a <span> for inline text (e.g. inside buttons, labels, or other inline contexts) while keeping existing pds-text styling and behavior.

No new dependencies. No documentation update beyond the auto-generated readme.md from the new prop value.

Fixes DSS-182

Type of change

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• unit tests
• e2e tests
• accessibility tests
• tested manually
• other:

Test Configuration:

• Pine versions:
• OS:
• Browsers:
• Screen readers:
• Misc:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Design has QA'ed and approved this PR

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